Correct Answer: (c) A is true, but R is false.
Solution:In the year 1951, the population of India was about 36 crore, which became more than 102 crore in Census 2001. There- fore, from 1951 to 2001, India's population almost tripled. The year 1921 is called 'the great divide year' in the demographic history of India. Hence, Statement is true but Reason is false. As per Census 2011, India's population became more than 121 crore.